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>> how to actually get that off the disk though.)
>
> A standard DVD's ".VOB" files are mpeg of whatever appropriate stripe.
Well, that's what I've heard, but aren't they multiplexed in an unusual way?
Also, certainly on the DVDs I've looked at, the video data is split into
several VOB files, seemingly at random. How do I join them back together?
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>> I don't have any way of generating DivX or Xvid. But IIRC, last time I
>> tried, no matter what settings I used the picture came out horrifically
>> blurry. I'd down the quality settings higher and higher, and the file
>> got larger and larger, but there was no visible improvement in the
>> picture.
>
> Then all those divx and xvid videos out there which look just fine must
> have been created by magic. ;)
If I ever come across one, I'll let you know. ;-)
Basically I've never seen a video on the Internet that doesn't look
horribly mutilated. (Presumably due to the bandwidth constrains it has
to fit through...) DVDs, on the other hand, almost always look just fine.
The only exception was when I downloaded Star Wrek. (But that took an
entire day to download.)
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scott wrote:
>> I don't have any way of generating DivX or Xvid.
>
> Lots of freeware tools can make it. One GUI tool that I find
> particularly easy to use is Xvid4PSP, lots of presets so no need to
> fiddle about with command line options if you don't want to.
At one point I had an encoder for either DivX or Xvid, I can't remember
which one. It seemingly had 30,000 options, and none of them seemed to
improve the image quality...
>> Since my camcorder records onto 8cm DVDs which are reputedly playable
>> on a normal DVD player, I'm presuming it generates MPEG-2. (I'm not
>> sure how to actually get that off the disk though.)
>
> There are much better compression algorithms (ie way lower bitrate for
> same quality) than the DVD-standard available. Read the instructions,
> I'm sure it will tell you how to get the video on to your computer.
I'll believe it when I see it. So far DVD is the only compressed video
I've ever seen that doesn't look visibly mutilated by the compression
process.
(E.g., if I take some POV-Ray video data and compress it - using every
codec I could find an encoder for - it always looks awful. If I ask my
DVD maker program to make a DVD out of it, it looks reasonably good.
[Although never as good as a commercial DVD - don't ask me why.])
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> I'll believe it when I see it.
Download something from this page:
http://www.microsoft.com/windows/windowsmedia/musicandvideo/hdvideo/contentshowcase.aspx
I recommend the Robotica one as a quick test.
> (E.g., if I take some POV-Ray video data and compress it - using every
> codec I could find an encoder for - it always looks awful.
Funny, I regularly encode POV stills using xvid4psp into MP4 format for my
PS3, it looks way better than any DVD.
> [Although never as good as a commercial DVD - don't ask me why.])
Add motion blur? Also the DVD standard allows different bitrates, make sure
you are using the highest one for small animations.
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> If I ever come across one, I'll let you know. ;-)
>
> Basically I've never seen a video on the Internet that doesn't look
> horribly mutilated. (Presumably due to the bandwidth constrains it has to
> fit through...) DVDs, on the other hand, almost always look just fine.
DVDs have a bandwidth of around 10 Mbit/s, but they use an old compression
technology. Using modern codecs on faster processors you can get higher
quality than DVD through 2-5 Mbit/s bandwidth. A friend of mine watches NFL
football over the net, in HD quality, at 2mbit/s. The quality is awesome (I
plugged my laptop into the TV), way better than any normal TV feed or DVD.
I was quite surprised how the quality was that good at such a low bitrate -
but it was using almost 100% of one of my CPUs continuously!
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scott wrote:
> DVDs have a bandwidth of around 10 Mbit/s, but they use an old
> compression technology.
MPEG-1 and MPEG-2 are old, no argument about that. ;-)
> Using modern codecs on faster processors you
> can get higher quality than DVD through 2-5 Mbit/s bandwidth.
You would hope so. It's just that I have yet to see such a thing. Every
codec I have ever tried has produced horrid results, with the exception
of MPEG-1 at really high bitrate, or whatever my DVD authoring software
is using (presumably MPEG-2, no idea what settings).
> A friend
> of mine watches NFL football over the net, in HD quality, at 2mbit/s.
> The quality is awesome (I plugged my laptop into the TV), way better
> than any normal TV feed or DVD. I was quite surprised how the quality
> was that good at such a low bitrate - but it was using almost 100% of
> one of my CPUs continuously!
Now, see, actually *getting* 2 Mbit/sec of real data over the Internet
seems like an impressive feat on its own...
(My Internet connection is supposed to deliver 8 Mbit/sec, but you never
actually get anything approaching that. Plus you're probably talking
about the bitrate of the codec; there's all the framing overhead and so
forth on top of that to consider - although presumably if it's streaming
it'll be UDP, not TCP...)
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>> I'll believe it when I see it.
>
> Download something from this page:
>
>
http://www.microsoft.com/windows/windowsmedia/musicandvideo/hdvideo/contentshowcase.aspx
I'll have to try that when I get home later. Obviously my work PC is
barely powerful enough to decode MPEG-1 in near-realtime. ;-)
> Funny, I regularly encode POV stills using xvid4psp into MP4 format for
> my PS3, it looks way better than any DVD.
Ah, OK then. That must be the "magic" Warp mentioned. Certainly it never
worked for me...
>> [Although never as good as a commercial DVD - don't ask me why.])
>
> Add motion blur? Also the DVD standard allows different bitrates, make
> sure you are using the highest one for small animations.
Well, one of my videos is a stationary image who's colours very slowly
change. But on the DVD, the colours seem to remain completely
stationary, except that once every 2 seconds they all change at once...
I'm guessing the video is below the change threshold or something.
The videos involving movement seem to work quite well. Possibly because
they move too fast for you to set and study every individual pixel -
hey, isn't that how perception-based codecs are supposed to work anyhow? ;-)
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Invisible <voi### [at] dev null> wrote:
> Basically I've never seen a video on the Internet that doesn't look
> horribly mutilated.
You clearly don't download pirated TV series and movies. That's very
commendable.
--
- Warp
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Warp wrote:
> You clearly don't download pirated TV series and movies. That's very
> commendable.
I don't download pirated *anything*. [Knowingly, anyway.]
In fact, about the only pirated items I own are... the scores for two
organ tocattas, actually. (One illegally photocopied from a book, one
illegally scanned from a book and downloaded from the Internet.)
Oh yeah, and I have a copy of "Golden Brown" by the Stranglers which I
didn't actually pay for.
Other than that, everything I own is ilegal.
(In the case of Borland's Turbo Pascal 5.5 for DOS, "legal" only because
the license recently changed...)
OTOH, I'm pretty sure that 98% of everything on YouTube is illegal, and
I have watched some of it, so...... ;-)
PS. I have a real TV and there isn't ever anything at on that I *want*
to watch. Why would I try to illegally download it? o_O
PPS. I did watch a pirate copy of The Tuxido at a friend's house once.
Man, why did I bother? I mean, apart from the fact that the film itself
is actually lame, the picture quality was absurd...
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> Other than that, everything I own is ilegal.
YOu heard it here first!
> PPS. I did watch a pirate copy of The Tuxido at a friend's house once.
> Man, why did I bother? I mean, apart from the fact that the film itself is
> actually lame, the picture quality was absurd...
You find that the bitTorrent sites are full of rips from the BluRay HD discs
now, the quality is quite exceptional. So I'm told.
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